
import java.io.File;

import java.io.IOException;

import java.util.Iterator;
import java.util.Random;

import java.util.List;

import java.util.UUID;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;

import org.apache.commons.fileupload.FileUploadException;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import org.apache.commons.fileupload.servlet.ServletFileUpload;

@SuppressWarnings("serial")
public class Upload extends HttpServlet {

	@SuppressWarnings("unchecked")
	public void doPost(HttpServletRequest req, HttpServletResponse response)

	throws ServletException, IOException {
		ServletContext servletContext = this.getServletConfig().getServletContext();
//		ApplicationContext appContext = WebApplicationContextUtils
//				.getWebApplicationContext(servletContext);
		String uploadFolder = (String) req.getParameter("folder");
		String savePath = this.getServletConfig().getServletContext().getRealPath("");
		savePath = savePath + "\\"+uploadFolder;

		File f1 = new File(savePath);
		if (!f1.exists()){
			f1.mkdirs();
		}
		System.out.println(savePath);

		DiskFileItemFactory fac = new DiskFileItemFactory();
		ServletFileUpload upload = new ServletFileUpload(fac);
		upload.setHeaderEncoding("utf-8");
		List fileList = null;
		try{
			fileList = upload.parseRequest(req);
		} catch (FileUploadException ex){
			return;
		}
		Iterator<FileItem> it = fileList.iterator();
		String name = "";
		String extName = "";
		while (it.hasNext()){
			FileItem item = it.next();
			if (!item.isFormField()){
				name = item.getName();
				long size = item.getSize();
				String type = item.getContentType();
				if (name == null || name.trim().equals("")){
					continue;
				}
				//扩展名格式：.flv
				if (name.lastIndexOf(".") >= 0){
					extName = name.substring(name.lastIndexOf("."));
				}
				File file = null;
				String format = "yyyyMMddHHmmss";
				Random r = new Random();
				do{
					//生成随机文件名：日期+四位随机数
					int rannum = (int) (r.nextDouble() * (9999 - 1000 + 1)) + 1000;
					//name = DateUtil.parseString(new Date(), format);
					name=String.valueOf(System.currentTimeMillis());
					name = name + rannum;
					file = new File(savePath + name + extName);
				} while (file.exists());

				File saveFile = new File(savePath + name + extName);
				try{
					item.write(saveFile);
				} catch (Exception e){
					e.printStackTrace();
				}
			}
		}
		response.getWriter().print(name + extName);
		System.out.println("OK");
}

}